Thiophenol-sulphonic acid tanning and mordanting agents



Patented 5.... 21 19 26.-

UNITED" STATES PATENT- OFFICE.

ALFRED THAUSS, OF DEU'IZ, NEAR COLOGNE, GERMANY, ASSIGNOB, BY MESNE AS- SIGNMENTS, TO GRABSELIII DYEBTUI'F CORPORATION, 01 NEW YOBK,N. Y., A COR- POBATION OF DELAWARE.

- TEIOPENNOIa-BUIJPKQNIC ACID TANNING AND MOBDANTING AGE NTS.

Ho Drawing. Application filed December 27, 1928, Serial No. 683,077, and. in Germany February 9, 1923'.

The United States Letters Patent No. 1,450,463 describes the manufacture and production of new sulphurized compounds of phenol or its homologues or substitution products by the action of sulphur upon phenolic bodies in the resence of caustlc alkali. Substantially i entical compounds are produced by the action of sulphur chloride upon phenols. In both cases sulphurized compounds containing more than an atom of su phur per molecule of phenolic body and characterized by their mordanting properties are obtained. These com unds are referred to'hereinafter as hig y sul-. phurized phenols.

It has now been found that new and valu able thio-derivatives can be obtained treating the above mentioned highly phurized phenols with sulphites of alkali metals preferably in the presence of oxidizing a nts, such as oxygen, air, hydrogen peroxide or the like.

The new products bemg probably thesulphonicacids are valuable mordants similar to those of the initial materials and have proved to be 've valuable tanning agents.

In order to ustrate my invention the followin example is given, the parts being by weig t:-

76 parts of phenol are dissolved with 30 parts of sodium hydroxide in 80 parts of water. gether with parts of sulphuri'n a vessel rovided with a reflux condenser for '30 ours until a homogeneous viscous mass is obtained which is easily soluble in water 'ving a clear solutioiiff" The melt obtained 1s then dissolved'in 10-15 times its volume of water and 90 parts by wei ht of neutral sodium sulphite are added. fter standing for several days at a temperature of about 80 G. and passing air through the-mass the product becomes-soluble in water. neutralization of the solution with hydro.-

'chloric acid and addition of common salt the product of the reaction separates as an almost white voluminous flocculent. mass. It adheres together when warmed and canthen be easily filtered ofi with suction." It is washed with cold water, dried and pulverized. As an alternative procedure the The resulting solution is boiled to-- agent.

melt is dissolved in water and acidified and-- be used. Air can be replaced by other oxidizing agents e. g. H 0 oxygen etc.

The products are believed to be com pounds of the type represented by the formula on g s-soa:

there is only one or more than one- -SSO,H group .in the molecule. It is understood that the foregoing formula is merely theoretical and that the invention is not limited thereto.

I claim -.1. In processes of producing thio henolsulphonic acid tanning and mor anting agents ing a highly sulphurized (phenol with an alkali metal sulphite. an an oxidizing agent vsubstantially as described.

2. n processes of producing a thiohenol-sulphonic acid tanning and -moranting agent the step which consists in treating highly 'sulphurized phenol with an alkali metal sulphiteand oxygen.

3. As a new product, a derivative of a phenol having tanning and mordanting but no dyeing properties, obtainable by treating a highly-sulphurized phenol with an alkall metal sulphite inpresence of an oxidizing agent. n

" 4. As a new product, a derivative of phenol having tanning and mordanting but no gyeing properties obtainable by treating hig y sul hurized phenol with an alkali metal sulp 'te in presence of an oxidizing 5 newproduct having tanning and lfiordanting properties obtainable by treating a phenohc body with an aqueous caustic the step which consists 'in treatalkali solution and sulphur and treating the rial produced with van alkali m etul sulmaterial so produced with an alkali metal phite and an oxidizin agent substantlally sulphite in presence of an oxidizing agent. as described.

6. A- new product having tanning and Intestimony whereof I have hereunto set I 5 mordanting properties obtainable treat-- my hand.

ing phenol with a, water solution 0 caustic alkali and sulphur and treating the mate- ALFRED THAUSS 

